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United States Patent | 5,043,504 |
Bedell | August 27, 1991 |
In a process of cyclodimerizing a conjugated diene to form a cycloalkene using a soluble iron complex as catalyst, the improvement comprises using as an inhibitor of diene polymerization, at least one hindered phenol.
Inventors: | Bedell; Stephen A. (Lake Jackson, TX) |
Assignee: | The Dow Chemical Company (Midland, MI) |
Appl. No.: | 578114 |
Filed: | September 5, 1990 |
Current U.S. Class: | 585/369; 585/3 |
Intern'l Class: | C07C 003/42 |
Field of Search: | 585/3,369 |
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TABLE 1 ______________________________________ SAMPLE ppm Percent OR inhibitor by conversion by EXAMPLE INHIBITOR weight moles ______________________________________ A 4-t-butylcatechol 100 39 1 3,5-di-t-butyl-4- 100 88 hydroxy-toluene (BHT) 2 3,5-di-t-butyl-4- 100 89 hydroxy-anisole B None 0 93 ______________________________________